/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassObserverManager.h
bool HasObserversForComposition ( const [FMassArchetypeCompositionDescriptor](API\Plugins\MassEntity\FMassArchetypeCompositionDescrip-) & Composition, const [EMassObservedOperation](API\Plugins\MassEntity\EMassObservedOperation) Operation ) const